package com.example.forum.services.impl;

import com.example.forum.common.AppResult;
import com.example.forum.common.ResultCode;
import com.example.forum.dao.BoardMapper;
import com.example.forum.exception.ApplicationException;
import com.example.forum.model.Board;
import com.example.forum.services.IBoardService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.Date;
import java.util.List;


@Slf4j
@Service
public class BoardServiceImpl implements IBoardService {

    @Resource
    private BoardMapper boardMapper;

    public List<Board> selectByNum(Integer num) {
        //非空校验
        if (num <= 0) {
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        List<Board> result = boardMapper.selectByNum(num);
        return result;
    }

    @Override
    public Board selectById(Long id) {
        if (id == null || id == 0) {
            log.warn(ResultCode.FAILED_BOARD_NOT_EXISTS .toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_BOARD_NOT_EXISTS));
        }

        return boardMapper.selectByPrimaryKey(id);
    }

    @Override
    public void addOneArticleCountById(Long id) {
             if (id == null || id == 0) {
                 log.warn(ResultCode.FAILED_BOARD_ARTICLE_COUNT.toString());
                 throw new ApplicationException(AppResult.failed(ResultCode.FAILED_BOARD_ARTICLE_COUNT));
             }
             Board board = boardMapper.selectByPrimaryKey(id);
             if (board == null) {
                 log.warn(ResultCode.ERROR_IS_NULL .toString() + ",board id " + id);
                 throw new ApplicationException(AppResult.failed(ResultCode.ERROR_IS_NULL ));
             }
             //更新帖子数量
           Board updateBoard = new Board();
             updateBoard.setId(board.getId());
             updateBoard.setArticleCount(board.getArticleCount()+1);
            boardMapper.updateByPrimaryKeySelective(updateBoard);
        //调用DAO执行更新
        int row = boardMapper.updateByPrimaryKeySelective(updateBoard);
        //判断受影响的行数
        if (row != 1) {
            log.warn(ResultCode.FAILED.toString() + "受影响的行数不等于1");
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED));
        }

    }

    @Override
    public void subOneArticleCountById(Long id) {
        if (id == null || id == 0) {
            log.warn(ResultCode.FAILED_BOARD_ARTICLE_COUNT.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_BOARD_ARTICLE_COUNT));
        }
        Board board = boardMapper.selectByPrimaryKey(id);
        if (board == null) {
            log.warn(ResultCode.FAILED_BOARD_NOT_EXISTS.toString());

        }
        //构造要更新的版块
        Board updateBoard = new Board();
        updateBoard.setId(board.getId());
        updateBoard.setArticleCount(board.getArticleCount()-1);
        //判断帖子减1后是否小于0
        if (updateBoard.getArticleCount() < 0) {
            updateBoard.setArticleCount(0);
        }

        //调用DAO
        int row = boardMapper.updateByPrimaryKeySelective(updateBoard);
        //判断受影响的行数
        if (row != 1) {
            log.warn(ResultCode.FAILED.toString() + "受影响的行数不等于1");
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED));
        }
    }

}
